(Solution) - The tensile strength of fiber used in manufacturing cloth is -(2025 Original AI-Free Solution)

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Academic Level: Undergrad. (yrs 3-4)

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The tensile strength of fiber used in manufacturing cloth is of interest to the purchaser. Previous experience indicates that the standard deviation of tensile strength is 2 psi. A random sample of eight fiber specimens is selected, and the average tensile strength is found to be 127 psi.

a. Build a 95% lower confidence interval in the mean tensile strength.
b. What can you conclude?